胎膜(fetal membranes)又稱胎外膜、駐外膜,是羊膜動物(爬行類、鳥類、哺乳類)個體發育過程中胚胎本體(胚體)以外的膜層結構,包括卵黃囊尿囊羊膜、漿膜或絨毛膜四種膜,它們由胚泡分化而來的衍生物,屬於一種胚外組織。胎膜對胎兒生長發育具有營養、保護、物質交換等重要功能。

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